She posted a picture of two guys and made public allegations about their conduct which resulted in their termination. To me this looks like grounds for a defamation lawsuit. Did they give permission to use the image of them? Did they admit to making these alleged jokes that she took offense to? There's something seriously wrong with this. I could take pictures of any two guys at an event and put it on Twitter and say they were gay bashing or using racial slurs, and they have no opportunity to defend themselves.
You could've read this thread to find the answers to most of your questions. Yes, the two gentlemen in question did make these jokes; one of them admits as much in this thread, and said so to the PyCon organizers when they investigated the incident. Yes, they had an opportunity to defend themselves.
You might not be familiar with defamation law in the United States, but understand that truth is an absolute defense against defamation. Nobody is disputing the facts of the incident (the actual content of what was said), and Adria's interpretation of the jokes (whether you agree with it or not) is clearly in the realm of opinion.
I could take pictures of any two guys at an event and put it on Twitter and say they were gay bashing or using racial slurs, and they have no opportunity to defend themselves.
Yet ask yourself: does this happen in the real world? Is there an epidemic of false, Twitter-aided public shamings? We've already established that this isn't an example, since no facts are in dispute. Maybe the implications of this incident aren't as far-reaching and scary as you think.
> Yes, they had an opportunity to defend themselves.
That is to say, they had an opportunity to defend themselves to the PyCon organizers. Who, subsequently, did not kick them out. From what I understand, after discussing the situation and hearing both sides (and, presumably, their apologies), PyCon issued them a warning. At least one individual then left of his own accord.
Where they had no opportunity to defend themselves was against the public shaming (and subsequent outcry) brought about by Adria's twitter post. At least not immediately, and by then the damage was done (I see that later one posted a comment on HN).
Regardless of what the law may or may not say, or whether or not they crossed any lines (and I believe they must have, to at least some degree, for Adria to have felt so strongly about it), Adria really did not give them any opportunity to even apologize, let alone present their side of the story.
Perhaps their jokes were truly indefensible somehow. But it hurts the community when, instead of affording each other some form of due process and making an effort to raise awareness and education, we choose arbitrary scapegoats and pursue vigilante justice.
This is seriously messed up.